How do you allow Dependabot to access private registries requiring authentication?

Beyond declaring the registry itself in dependabot.yml (its type and URL), you need to reference a Dependabot secret holding the actual authentication credential (token, username/password) that registry requires — connecting the registry declaration to the credential via the registries configuration block.

#  dependabot.yml
registries:
  my-private-pypi:
    type: python-index
    url: https://pypi.internal.example.com/simple
    username: "svc-dependabot"
    password: "${{ secrets.PRIVATE_PYPI_PASSWORD }}"

updates:
  - package-ecosystem: "pip"
    directory: "/"
    registries:
      - my-private-pypi
    schedule:
      interval: "weekly"

Note the final step often missed: each updates entry must also explicitly list which registries it should use under its own registries key — simply declaring a registry at the top level isn't enough; each ecosystem entry that actually needs it has to opt in explicitly.

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